ios - 弹出1秒

Question

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Answer 1

如果您只想显示一条 float 消息一段时间然后让它逐渐消失，只需制作一个标签和一个简单的动画即可。此示例将显示消息 1 秒，然后在 0.3 秒内逐渐消失(并假定 ARC):

- (void)showMessage:(NSString*)message atPoint:(CGPoint)point {
    const CGFloat fontSize = 24;  // Or whatever.

    UILabel* label = [[UILabel alloc] initWithFrame:CGRectZero];
    label.backgroundColor = [UIColor clearColor];  
    label.font = [UIFont fontWithName:@"Helvetica-Bold" size:fontSize];  // Or whatever.
    label.text = message;
    label.textColor = [UIColor blueColor];  // Or whatever.
    [label sizeToFit];

    label.center = point;

    [self addSubview:label];

    [UIView animateWithDuration:0.3 delay:1 options:0 animations:^{
        label.alpha = 0;
    } completion:^(BOOL finished) {
        label.hidden = YES;
        [label removeFromSuperview];
    }];
}

只需将其作为方法添加到您的 Root View 中即可。